Record of a Thousand Lives

Record of a Thousand Lives summary:

He died because he could not kill ‘him’.
He lived because he could not kill ‘him’.
Kang Yoonsoo, who had lived 999 lives by losing to the Demon Emperor.
Once again, he went back twenty years in time, back to his starting point.
“I will end this.”
Either he dies, or ‘he’ dies.
The thousandth life of a man who has mastered all the skills in the world begins.